https://youtu.be/VoLZXXQL-YY

Chapter – Magnetic effects of electric current

Q1. A) what is the nature of the magnetic field inside a solenoid?

b) What is the nature of the magnetic field due to a circular coil?

Q2. How does the magnetic field (B) due to a straight conductor vary with distance (r) from it?

Q3. How does the magnetic field(B) vary inside a solenoid?

Q4. How are magnetic field lines related to the strength of a magnetic field?

Q5. What is the relation between magnetic field(B), current (I) and distance (r) in case of a straight current carrying conductor?

Q6. What is meant by the term magnetic field lines? List two properties of magnetic field lines?

Q7. Write the rule which determines the direction of magnetic field developed around a straight conductor when current is passed through the conductor?

Q8. What kind of energy transformation takes place in an electric motor? Name any two devices which use an electric motor as an essential component?

Q9. On what factors the strength of magnetic field produced by current carrying solenoid depends?

Q10. Why does a current carrying conductor kept in a magnetic field experience a force? On what factors does the direction of this force depend? Name and state the rule used for determination of direction of this force?

Q11. How does the strength of the magnetic field at the centre of a circular coil of wire depend on:

i)                    The radius of the coil

ii)                   The number of turns of wire in the coil

iii)                 The strength of the current flowing in the coil.

Q12. How does a solenoid behave like a magnet? Can you determine the north and south poles of a current carrying solenoid with a help of bar magnet? Explain

Q13. When is the force experienced by a current carrying conductor placed in a magnetic field is largest?

Q14. Explain the principle of electric motor and electric generators (AC and DC). What is the function of a split ring in an electric motor?

Q15. A coil is insulated copper wire is connected to a galvanometer. What would happen if a bar magnet is

i)                    Pushed into the coil

ii)                   Withdrawn from inside the coil

iii)                 Held stationary inside the coil

Q16. State the rule to determine the direction of a

i)                    Magnetic field produced around a straight conductor carrying current

ii)                   Force experienced by a current carrying straight conductor placed in a magnetic field which is perpendicular to it.

iii)                 Current induced in a coil due to its rotation in a magnetic field

Q17. When does an electric short circuit occur?

Q18. What is the function of an earth wire? Why is it necessary to earth metallic appliances?

Q19. What does the direction of thumb indicate in the right hand rule? In what way this rule is different from Fleming’s left hand rule?

Q20. What is the role of the two conducting stationary brushes in a simple electric motor?

Q21. What is the role of fuse used in series with any electrical appliance? Why should a fuse with defined rating not be replaced by one with a larger rating?

Q22. List factors on which the value of induced current produced in a circuit depends.

Q23. Name and state the rule used to determine the direction of induced current.

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Army Public School Damana

Holidays homework (Session 2017-18)

Science Assignment                                                                             Class X

1.       Draw the Memory Enhance Map &Chapter at a glance of the Chapter Electricity , Magnetic effects of electric current, Chemical reactions & equations, Acids, bases & salts, Life Processes.

2.       State the law that shows the relationship between the potential difference (V) across the two ends of a conductor and the current (I) flowing through it. Also draw the schematic circuit diagram .

3.       The resistivities of some substances are given

Material	A	B	C	D	E
Resistivity Ω m	1.6 x 10-8	6.4 x 10-8	10 x 10-8	96 x 10-8	100 x 10-8

Answer the following questions:

i)                    Which material is best for making connecting cords?

ii)                   Which material is best to be used in heater elements?

iii)                 You have two wires of same length and same thickness. One is made of material A and another of material D. If the resistance of wire made of A is 2 Ω what is the resistance of the other wire?

4.       A wire is stretched so that its length becomes 6/5 times its original length. If its original resistance is 25 Ω, find its new resistance and resistivity.

5.       A household uses the following electric appliances:

i)                    Refrigerator of rating 400W for ten hours each day.

ii)                   Two electric fans of rating 80W each for twelve hours each day.

iii)                 6 electric tubes of rating 18W each for 6h each day.

Calculate the electricity bill for the month of June if the cost per unit of electric energy is Rs 3.00

6.       An electric lamp is marked 100W, 220 W. It is used for 5 hours daily. Calculate

i)                    Its resistance, while glowing

ii)                   Energy consumed in kWh per day.

7.       Solve the textual questions of above (1) chapters.

8.       Explain with proper chemical equations:

a)      Reaction of acid with metals.

b)      Reaction of acids with metal carbonates

c)       Reaction of base with acids

d)      Reaction of base with metals

9.       Give chemical name manufacturing and properties of baking soda, washing soda, bleaching powder, caustic soda, Plaster of Paris.

10.   A metal carbonate X on reacting with an acid gives gas which when passed through a solution Y gives the carbonate back. On the other hand, gas T that is obtained at anode during electrolysis of brine is passed on dry Y,  it gives a compound P, used for dis infecting water. Identify X,Y, T and P.

11.   Plant at least five plants near your locality or at home.

12.   Complete your practical notebooks.

13.   Draw neat and well labelled diagram of Human heart, excretory system,Neuron, Nephron, brain in your biology notebook.

Revise the whole syllabus for PT1

HAPPY HOLIDAYS ...........

Fill the sheet

Assignment I Class X 2018-19

Q1. Which is a converging mirror: convex or a concave mirror?
Q2. What is a relation between focal length and radius of curvature of a convex mirror?
Q3. What is the formula for linear magnification of a spherical mirror?
Q4. What is the angle of incidence when a ray falls normally on a mirror?
Q5. What is a mirror formula?
Q6. Out of convex and concave mirror, the magnification of which mirror is always positive?
Q7. The magnification of a concave mirror is -1. What is the position of the object?
Q8. Which colour of light travels fastest in vacuum?
Q9. When light goes from one medium to another, which of the three parameters frequency,
        wavelength, velocity change?
Q10.  Refractive index of glass w.r.t. air is 3/2 and refractive index of water w. r. t. air is 4/3. What is
         refractive index of glass w.r.t. water?
Q11. What is the speed of light in water of refractive index 4/3?
Q12. Light travels in a medium with a velocity of 2x 108 m/s. what is refractive index of the medium?
Q13. Refractive index of diamond w.r.t. glass is 1.6 and absolute refractive index of glass is 1.5. Find out
         the absolute refractive index of diamond.
Q14. On what factor does the focal length of a spherical mirror depend?
Q15. Why light refracts?
Q16. How does light bend while travelling from denser to rarer medium?
Q17. What are the units of refractive index?